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authorToke Høiland-Jørgensen <toke@redhat.com>2020-04-14 16:50:25 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2020-04-15 13:26:08 +0200
commitc6c111523d9e697bfb463870759825be5d6caff6 (patch)
treefb949e0ba4bb00676e818ac3d3a70efa62781a18 /tools
parent49b452c382da2c2d1ccee1265cbb92da905c82f7 (diff)
downloadlinux-c6c111523d9e697bfb463870759825be5d6caff6.tar.bz2
selftests/bpf: Check for correct program attach/detach in xdp_attach test
David Ahern noticed that there was a bug in the EXPECTED_FD code so programs did not get detached properly when that parameter was supplied. This case was not included in the xdp_attach tests; so let's add it to be sure that such a bug does not sneak back in down. Fixes: 87854a0b57b3 ("selftests/bpf: Add tests for attaching XDP programs") Reported-by: David Ahern <dsahern@gmail.com> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20200414145025.182163-2-toke@redhat.com
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/xdp_attach.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
index 05b294d6b923..15ef3531483e 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
@@ -6,19 +6,34 @@
void test_xdp_attach(void)
{
+ __u32 duration = 0, id1, id2, id0 = 0, len;
struct bpf_object *obj1, *obj2, *obj3;
const char *file = "./test_xdp.o";
+ struct bpf_prog_info info = {};
int err, fd1, fd2, fd3;
- __u32 duration = 0;
DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts,
.old_fd = -1);
+ len = sizeof(info);
+
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
if (CHECK_FAIL(err))
return;
+ err = bpf_obj_get_info_by_fd(fd1, &info, &len);
+ if (CHECK_FAIL(err))
+ goto out_1;
+ id1 = info.id;
+
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
if (CHECK_FAIL(err))
goto out_1;
+
+ memset(&info, 0, sizeof(info));
+ err = bpf_obj_get_info_by_fd(fd2, &info, &len);
+ if (CHECK_FAIL(err))
+ goto out_2;
+ id2 = info.id;
+
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
if (CHECK_FAIL(err))
goto out_2;
@@ -28,6 +43,11 @@ void test_xdp_attach(void)
if (CHECK(err, "load_ok", "initial load failed"))
goto out_close;
+ err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
+ if (CHECK(err || id0 != id1, "id1_check",
+ "loaded prog id %u != id1 %u, err %d", id0, id1, err))
+ goto out_close;
+
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, XDP_FLAGS_REPLACE,
&opts);
if (CHECK(!err, "load_fail", "load with expected id didn't fail"))
@@ -37,6 +57,10 @@ void test_xdp_attach(void)
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, 0, &opts);
if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
goto out;
+ err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
+ if (CHECK(err || id0 != id2, "id2_check",
+ "loaded prog id %u != id2 %u, err %d", id0, id2, err))
+ goto out_close;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd3, 0, &opts);
if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
@@ -51,6 +75,10 @@ void test_xdp_attach(void)
if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
goto out;
+ err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0);
+ if (CHECK(err || id0 != 0, "unload_check",
+ "loaded prog id %u != 0, err %d", id0, err))
+ goto out_close;
out:
bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
out_close: